function changevisible(element){  
        var children = element.parentNode.childNodes;  
          
        for(var i= 0; i<children.length;i++){  
              
            if(children[i].nodeName == "DIV"){  
                   
                var className = children[i].className;         
                  
                if(className == "show" ){  
                      
              //      element.className="fold";  
                    children[i].className="hidden";  
                }  
               else{  
              //     element.className="expend";  
                     children[i].className="show";  
                }  
            }  
        }  
    }